SLIDING DOOR OPENING AND CLOSING DEVICE

Provided is a device for opening and closing a sliding door, of which collinearly placed doors slide respectively to overlap each other such that the sliding door is opened or closed. The device includes a sliding portion formed on a surface on which doors come into contact with each other in order to prevent the doors from interfering with each other when the doors are opened; a pair of rail frames formed on a top surface of the furniture and provided with a rail protruding upwardly such that each door is slid forward and backward on the rail, the rail having both sides in which bending portions are formed; and rotational members, each of which is installed to one side of a connection bracket to be rotatable in a curved section of the bending portion while being lifted and slid on the rail, wherein an opposite side of the connection bracket is coupled to an upper end of the door. Thus, the door may be smoothly opened or closed without any additional forward and backward transporting means. In addition, the device may have an excellent assembly property due to the simplest components and the manufacturing cost may be remarkably reduced.